||6" diagonal E-Inkª electronic paper display, 600 x 800 pixel resolution at 167 ppi, 16-level gray scale. EVDO modem with fallback to 1xRTT; utilizes Amazon Whispernet to provide U.S wireless coverage via Sprint's 3G high-speed data network. 3.5mm stereo audio jack, rear-mounted stereo speakers. Content formats supported: Kindle (AZW), TXT, Audible (formats 4, Audible Enhanced (AAX)), MP3, unprotected MOBI, PRC natively; PDF, HTML, DOC, JPEG, GIF, PNG, BMP through conversion. Read on a single charge for up to 4 days with wireless on. Turn wireless off and read for up to two weeks. Battery life will vary based on wireless usage, such as shopping the Kindle Store and downloading content. In low coverage areas or in 1xRTT only coverage, wireless usage will consume battery power more quickly. Fully charges in approximately 4 hours and supports charging from computer via the included USB 2.0 cable.